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this controller differs from a regular pool pump controller in that it does not employ a pair of trippers to start and stop a pump - a single tripper gives you 12 minutes of "on" - there are no "off" trippers

if you needed six continuous hours of pumping, then you would need 30 individual trippers placed upon the dial

I wouldn't back any bet that the original post has the number exactly correct. Besides, the question is whether a controller that has only "on" trippers is suitable for swimming pool use. If and only if there are sufficient trippers on hand, would the answer be yes. For the money, and ease of use, a controller using both on and off trippers is the popular choice.